[.NET] UI.DrawTexture position parameter & screen resolution

For the life of me I couldn't find a single source that says what scale UI.DrawTexture uses for its 'position' parameter.

For my screen (at 1920x1080), the bottom-right is (1280, 720). Does this mean that the method always assumes the screen is 1280 x 720 for its positioning, regardless of actual resolution? If so, what happens with screens with non-widescreen aspect ratios?